Insulated railway track construction



April 26, 1932.

B. E. BALDUF INSULATED RAILWAY TRACK, CONSTRUCTION Filed June 20, 193' INVENTOR B/eu/vo EBHLDUFI' ATTORNEY Patented Apr. 26, 1932 UNITED STATES PATE ToFFmE BRUNO E.

INSULATED RAILWAY 'rRAcK oons'rnuc'mon Application filed. June 20, 1931. Serial'No. 545,705.

. This invention relates to railway track constructions, and has reference more particularly to. track constructions in which the rails are resiliently supported by springs to avoid transmitting vibration to the rail supporting framework and thus decrease the amount of noise produced by the train.

In my Patent 1,811,250 on June 23, 1931, I have'described the type of spring clip for reducing sound caused by sound waves or impact vibrations and I find that this type of clip is especially advantageous in railway constructions for supporting the track and preventing vibrations from being transferred to; the supporting railroad base or framework. The sound insulation of railway tracks is especially important in thickly populated districts where elevated or surface tracks are used, and it is also important in subways where the sound produced by the passing trains are reverberated and are often of such volume as to cause discomfort to the rider in the train.

An object of this invention, therefore, is to provide a construction suitable for sup porting the rails of railroads so as to reduce the sounds and vibrations produced by passing trains.

Another object of the invention is to provide a resilient support for railroad rails to prevent the vibration of theroad bed or framework supporting the rails.

A further object of the invention is to provide a resilient construction for supporting railway rails which will be economical to manufacture and install; also to improve railway constructions in other respects hereinafter specified and claimed.

Reference is to be had to the accompanying drawings forming a part of this specification, in which Fig. 1 is a sectional elevation through my improved railway construction showing the application of the spring clips for supporting the rails,

BALIDUF, or CHICAGO, ILLINOIS, ASSIGNOR TO UNITED scams GYI'SUM'. COMPANY, or cmceeo, ILLINOIS, A CORPORATION. or rumors Fig. 2 is aplan view. one of my resilient bases orunits under a rail,

Fig. 3 is a sectional elevation through the railway construction taken 'on line '33 of Fig. 1,

Fig. .4 is asectional elevation through a modified form of the' railway construction, 7 Fig. 5 is a plan view of the construction shown in Fig. 4:, p

Fig. 6 is a sectional elevation through the modified construction taken on line 6 6 of Fig. 4, and

1 Fig. 7 is a perspective view of one of the multiple leaf spring clips which Iprefer to use in the railway construction. r Fig. 8 is a modified form of spring clip.

In carrylng out myinvention, Ipreferably utilize a number of spring clipsas described in said Patent 1,811,250 superposed one on the other and secured together at their central saddle portion 10. and at their two ends 11 as by spot-welding,riveting, bolting or the like.

Integral loops 12 connect the saddle members I 10 to the clip ends 11, said loopsbeing arranged to first extend upwardly at an angle to the vertical fromthe saddle member 10, curve in arcuate form, and then extend downwardly atan angle to the vertical to form legs 13 which are integrally connected. with the inner edges of the clip ends 11. In assembling several of the clips" to form a; multiple leaf spring, using say three clips as shown'in Fig. 7, the-'arcuate sections 12 are preferably spaced slightly apart so that theycan act independently of each other and thus produce a somewhat superioreffect from a sound and vibration reducing standpoint. By spacing the loops 12 apart, they canalso deflect independently of each other without friction contact and thus eliminate the necessity of oiling between the springs. By utilizing the multiple leaf springs, I can support very heavy loads in the form of railway trains, and still arrange my spring clips over a comparatively small area, thus materially reducing the installation cost.

Any number of the multiple leaf springs may be assembled to form a unit having the desired resiliency and deflection under a given load. For example, in Figs. 1 and 2, I have shown one of these units as composed of twelve of these multiple leaf springs which are secured to a plate 15 by spot-welding or by other suitable means. The plate 15 is preferablyrectangu lar inzashape and three of "its edges 'arepro vided with bevels' 16 to be received inside of upwardly tapered flanges 17 formed along three-sidesv of aIsimi-lar hold ing plate 18.: The' fourth .-edge of the plate I 18 extends somewhat beyond the base plate 15 and is provided witlr ajplura'lityrof brackeets 19 held down by tap bolts 20 for retaining the plate 15 in positionorr the plat'e 18. 'A

suitable shoulder 21' is formed on the bracket 19*for preventing;displacement of the plate 15 inwardly as'seenin Fig: 1; Asphalt emulsion 221101"othersuit'able waterproofing agent may be used between theplates 15 and 18'to prevent rusting thereof and to secure said plates'together; The plate-181s supported by a masonrypitfliw, being secured thereto by grouting material'24 which is adapted to give a uniform contact ofthe plate 18" on the pit23 at all times; The pitfZZihas acentral gutter 25 between the rails 26; and has upstanding walls 27 at. each .side,. one of whichmaybe used-to support the third. rail. 28. which is commonly used for electric railways;

The. spring-clips are preferably arranged on the'plate =15 in rows;(Figs. 1 and 2) of any desired'numbe'r -such;as three", each row containingfour clips making 12 clips to a unit; Each row'of'sprin'g clips has its saddlememb'e'rs 10 in" alignment for' receiving parallel ribs 30 which. may be of bar steel and sup ported at"thei-'r"u'pper edges: by transversely extending grid' blars' 31', also'of bar steel and welde'dto the-' bars-30.- A plate 32"may extend over the" bars 31 and be provided with downwardly extending HangesSQ on each edge. I The barsS-lare' preferably rigidly se curedto the plate 32 and steel blocks 34'are secured toithe upper: face: of the plate 82 as bybolts135. A pair of blocks '34 is'used;.and thespacebetween is partially filled with a wooden block 36 upon which the-base 87 of V ra-il.;2.6.rests. Clamps; 38.are-secured by bolts 39' to-each Ofztl'lGblOCkSi'lb-filld bear onthe uppersurface. of. the. rail base37- to hold said rail firmly in-positionon the wooden block 36;.

Gussetnplates 40 are securedtothe upper face of'plate 32andfexten-d outwardly therefrom to be attachedto. a tie truss. 42"which may be. composed of. two angles back to back said; truss bei'ng securedi. to the plate.4'0'as by bolts 43,.rivet s' or the-like. The'truss 42 thus. connects" the two, resilient" units supporting-each of the rails and" actssto accurately space the rails 26 the desired distance apart to lit the wheels of the railway train. In order to prevent any material side-play of the rails 26 under the action of a moving railway train, I provide auxiliary springs 45 of the same shape as the multiple leaf spring heretofore described. These springs 45 are preferably arranged in a row and secured to an upstanding bracket or flange 46, secured to each end of the plate 15.

A bar 47 is secured across the aligned saddles vided in. the space between the-outer-mosti flange 33" and its adjoining masonry ledge 27 so as to preventany dirt or water from get ting into the space. occupied'by the spring clips. A filling'material-50-ofoil' or asphalt impregnated fibrous materialiof low density is alsoinreferably' placed in the space around the springpclip's so as tokeepsaid'clipsilu bricated and to also prevent any drumaction duefto' sounds reverberating. in the" space around the clips. 8 i Y' Inth-e-modified form of the" invention shown in Figs.;4, 5; and 6, the construction above the plate 32a is preferably altered in that'short wooden block' 5'2-of'abou-t? the cross-sectionalarea of an ordinary railway tie-, rests onsaidplate-32a and is secured thereto by upstanding plates 53" which are welded to the downstand-ing flanges 83a formed around the outside periphery; offa plate 32a. Inwardlyextending flanges are formed along the top edgeof'plates- 5'3 and extend into registering slots in the blocks 52' so as to permit the removal and replacement of'said blocks at intervals. 'A metalrail bracl'z'et 53b is" supported on'each of the wooden blocks .52, beingprovided'on its upper surface'by a recess 54. for receivingthe base'37 of. the rail'ft. Spikes: 5-5 are then passed throughv openings in the bracket 53 and connect the raillbase'37t'o said block v 52.. A. tie bar 56, extends between the rails 26 and'hias a hook 57'on eachiend adaptedto receive the outside edge of railibase 37. bar 58 is secured by bolts 59 near each endrof the tie bar'56, and hasanoffsetendfil) for. en= gagingthe-opposite edge of. the railbasei 37.

In the type ofmodified spring clipshown in Fig. 8, the saddle member 61' is forined at each ofits ends. intoaa pair *of spring-loops 62 and 63 terminatingin: clip ends 64 which may extend perpendicularly I to the saddle member 61 and be attached to thenpstand ing legs of a supporting channel not shown. Through the use of this type of clip, the upper plates 32 or 32a may be connected directly to said saddle members 61, thus eliminating the necessity of the ribs 30 and 31.

I would state in conclusion, that while the illustrated. examples constitute practical embodiments of my invention, I do not wish to limit myself precisely to these details, since manifestly, the same may be considerably varied without departing from the spirit of the invention as defined in the appended claims.

Having thus described my invention, claim as new, and desire to secure by Letters Patent p 1. In a resilient rail construction, a unit plate, a plurality of flat spring clips secured to said plate, each of said clips having a central, integral saddle member, and a rail plate secured to said saddle members to form a resilient supportfor a rail so as to induce vibrations of said unit plate by the passage of a train along said rail.

2. In a resilient rail construction, a unit plate, a plurality of flat, spring ciips secured to said plate, each of said clips having a central, integral saddle member, a rail plate secured to said saddle members to form a resilient support for a rail, and a material of low density positioned around said spring clips to keep out dirt and prevent drum action between said plates.

3. In a resilient rail construction, a pair of plates in spaced, parallel relation, a rail supported by one of said plates, flat, spring clips between said plates and having central, integral, saddle me bers secured to one of said plates and outstanding ends in a different plane than said saddle members and secured to the other of said plates, and integral, arcuate loops connecting said clip ends and saddle members.

4. In a resilient rail construction, a pair of supporting elements in spaced, parallel relation, a rail supported by one of said elements, and spring clips having portions thereof secured to each of said elements, said clips comprising a plurality of superimposed, independently acting leaves.

5. In a resilient rail construction, a pair of supporting elements in spaced relation, a rail supported by one of said elements, spring clips having portions thereof secured to each of said elements to permit vertical, relative movement of said elements, and auxiliary spring clips associated with said rail supporting element to permit limited, yielding, lateral movement of said rail supporting element.

6. In a resilient rail construction, a pair of supporting elements arranged in a substantially horizontal plane, a rail supported on each of said elements in spaced, parallel relation, a plurality of flat spring clips below each of said elements and secured thereto,

iary spring clips said clips having integral saddle sections and ends in diiferentplanes, a base element supporting'saidclips, and a tie element connecting said rail supporting elements 5 7 In a resilient ra1l"construction, a pair parallel relation, a plu-' of plates in spaced,

rality of stiffening ribs secured to the lower face of the upper of said plates, a plurality of flat, spring clips having central, integral saddle sections secured to said ribs, and in-v tegral, outstanding legs on said clips in a plane different than said saddle sections,

I said clip ends being secured to the lower-' most of said plates. i V

8. In a resilient rail construction, a pair of plates in spaced, parallel relation, a rail supported on the upper of said plates, flat spring clips secured to the inside faces of 7 said plates to permit vertical movement of the upper plate relativeto the lower plate, said clips being arranged to permit lateral movement in one direction only ofthe upper plate relative to the lower plate, and auxilassociat-ed with said plates and arranged to yieldingly limit the lateral movement of the upper plate relative to the lower plate.

9. In a resilient rail construction, a pair of plates in spaced, parallel relation, a rail supported on the upper of said plates, fiat spring clips the said plates to permit vertical movement of the upper plate relative to the lower plate, said clips being arranged to permit lateral movement in one direction only of the upper plate relative to the lower plate, telescoping, inwardly extending flanges formed on opposite edges of said plates, and auxiliary spring clips between said flanges and arranged to yieldingly limit the lateral movement of the upper plate relative to the lower plate.

10. In a resilient rail construction, a pair of spaced, parallel plates, flat spring clips yieldingly connecting said plates, a rail supported by the upper of said plates, plate for supporting the lower of said plates, retaining flanges formed on a plurality of edges of said base plate, and clamping means for locking said lower plate between the flanges of said base plate.

11. In a resilient rail construction, an elongated masonry'road bed having upstanding flanges along each edge thereof, a plurality of flat spring clips supported by said road bed, a plate yieldingly supported said clips, a rail supported by said plate, and packing material between said plate and said road bed flanges for preventing the passage of dirt into the space around said clips.

12. In a resilient .rail construction, an elongated road bed, a' plurality of flat spring clips supported by said road bed, a plate yieldingly supported by said spring clips, a block of wood supported by said plate, and a rail supported by said block of wood.

secured to the inside faces of a base '13 In: a. resilient rail construction; a pain of; suppbrting: elements in spiaced.relati0n-, a. railzsupportedby one of said-elements; 3513388? for supporting; the other offsaidl elements, flat spring clips between said elements having central, integral; saddle memberssup--- perting; one: of said support elements, spring:

ends-in: a difl'erenti plane than said saddle members and" supported byv the'other of. said; support elements, and integral, arcuateloops connecting said clipends and; saddle membersrso as to form a resilient support. for:

said rail andiso'as to reduce vibrations of-i said base by the passage" Ofi a train along:

saidirail. v

i I BRUNO E. BALDUF...

CERTIFICATE OF CORRECTION.

Patent No. 1,855,177. April 26, 1932.

BRUNO E. BALDUF.

It is hereby certified that error. appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 11, after the word "vibrations" insert a comma; page 3, line 21, claim 1, f0r"'induce" read reduce; and that the said Letters Patent should be read with these corrections therein that the some may conform to the record of the case in the Patent Office.

Signed and sealed this 5th day of July, A. D, 1932 M. J. Moore,

(Seal) Acting Commissioner of Patents. 

